Praat for Debian (64-bit) is a free scientific software program for the analysis of speech in phonetics. Praat analyzes mono signals. But within certain limits, stereo signals can be recorded and saved, opened, and played back in stereo. The modest support for stereo signals that Praat does provide is there for the convenience of colleagues who have their speech material in stereo form. In fact, outside the lab, it is almost impossible nowadays to produce mono tape recordings with standard equipment and standard connecting cables. Most portable recorders record in stereo nowadays.